a: \(\left(x-\dfrac{3}{5}\right)\cdot\dfrac{3}{8}-\dfrac{5}{8}=\dfrac{1}{6}\)
\(\Leftrightarrow\left(x-\dfrac{3}{5}\right)\cdot\dfrac{3}{8}=\dfrac{1}{6}+\dfrac{5}{8}=\dfrac{4}{24}+\dfrac{15}{24}=\dfrac{19}{24}\)
\(\Leftrightarrow x-\dfrac{3}{5}=\dfrac{19}{24}:\dfrac{3}{8}=\dfrac{19}{24}\cdot\dfrac{8}{3}=\dfrac{19}{9}\)
hay x=122/45
b: \(\Leftrightarrow\dfrac{7}{6}-\dfrac{5}{6}:\left(x+\dfrac{1}{4}\right)=\dfrac{1}{2}\)
\(\Leftrightarrow\dfrac{5}{6}:\left(x+\dfrac{1}{4}\right)=\dfrac{7}{6}-\dfrac{3}{6}=\dfrac{2}{3}\)
=>x+1/4=5/6:2/3=5/6x3/2=15/12=5/4
=>x=1
`(x-3/5)xx3/8-5/8=1/6`
`(x-3/5)xx3/8=1/6+5/8`
`(x-3/5)xx3/8=4/24+15/24=19/24`
`x-3/5=19/24:3/8=19/9`
`x=19/9+3/5=122/45`
_______________________________________________________
`1 1/6-5/6:(x+1/4)=1/2`
`7/6-5/6:(x+1/4)=1/2`
`5/6:(x+1/4)=7/6-1/2=2/3`
`x+1/4=5/6:2/3=5/4`
`x=5/4-1/4=4/4=1`
( x - 3/5 ) x 3/8 - 5/8 = 1/6
( x - 3/5 ) x 3/8 = 1/6 + 5/8
( x - 3/5 ) x 3/8 = 19/24
x - 3/5 = 19/24 : 3/8
x - 3/5 = 19/9
x = 19/9 + 3/5
x = 122/45
mik tạm thời chỉ giải ý a thôi nhek
hok tốt !!#@
